Boston Fern
Nephrolepis exaltata 'Bostoniensis'
Through the year 🗓️
☀️ Summer now
Loves a shaded porch; never let it dry out in the heat.
🍂 Fall
Bring it in before frost and expect some adjustment shedding.
❄️ Winter
Heated indoor air is the enemy: pebble tray, humidifier, or bathroom duty.
🌱 Spring
Refresh or divide, and trim old fronds at the base.
The details
Light & placement
- Light
- Bright indirect; morning sun OK; scorches in hot direct light
- Ideal PPFD
- 100–250 µmol·m⁻²·s⁻¹
- Grow-light distance
- 20–28 in below LED
Water & feed
- Watering method
- Keep evenly moist, never soggy, often 2×/week in warm months. Never let it dry out fully.
- Fertilizer
- Balanced feed at ¼ strength, monthly spring–summer.
Home & habit
- Soil
- Peaty, moisture-holding mix; pH 5.0–5.5
- Humidity
- High (50–80%); the make-or-break factor, and it loves bathrooms & pebble trays
- Temperature
- 60–75 °F
- Mature size
- 1–3 ft mounds, arching fronds
- Repotting
- Every 1–2 yrs in spring
- Propagation
- Division; runners (stolons) pinned to soil.
When something looks wrong
- Overwatering signs
- Yellow, limp fronds; rotting crown
- Underwatering signs
- Gray-green then crispy fronds; heavy leaflet shedding
- Common pests
- Spider mites in dry air; mealybugs, scale
Common problems 🩺
The usual suspects when Boston Fern looks unhappy. Most houseplant trouble is watering or light, not disease — see all plant problems if you are not sure which plant is the culprit.
Crispy brown fronds
Likely cause
Dry air — the most common Boston fern complaint indoors.
What to do
Raise humidity well above 50% (a bathroom or a humidifier) and keep the soil evenly moist.
Yellowing, thinning fronds
Likely cause
Too little water or light.
What to do
Keep it consistently moist, never bone-dry, in bright indirect light.
Heavy frond drop and shedding
Likely cause
A dry spell or a move to a drier spot.
What to do
Trim the worst, boost humidity, and keep watering; ferns rebound from the crown.
More like this 🌿
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